litmus-rt.git - The LITMUS^RT kernel.

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author	Laurent Pinchart <laurent.pinchart@ideasonboard.com>	2011-09-11 17:30:45 -0400
committer	Laurent Pinchart <laurent.pinchart@ideasonboard.com>	2012-03-12 17:41:13 -0400
commit	c241a0e0c27882ecab1df57a44d202db6e02012c (patch)
tree	a92eb038c484c28cfdc9300900180f602d69ce41 /kernel/audit.c
parent	b5ef967df13d4d243a2954c32bdd9181a1ee7382 (diff)

arm: mach-shmobile: Constify sh_mobile_meram_cfg structures

The structures, passed to the sh_mobile_lcdcfb driver through platform data, are read only by the driver. Make them const. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Diffstat (limited to 'kernel/audit.c')

0 files changed, 0 insertions, 0 deletions

/* * Fast batching percpu counters. */ #include <linux/percpu_counter.h> #include <linux/notifier.h> #include <linux/mutex.h> #include <linux/init.h> #include <linux/cpu.h> #include <linux/module.h> #include <linux/debugobjects.h> static LIST_HEAD(percpu_counters); static DEFINE_MUTEX(percpu_counters_lock); #ifdef CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER static struct debug_obj_descr percpu_counter_debug_descr; static int percpu_counter_fixup_free(void *addr, enum debug_obj_state state) { struct percpu_counter *fbc = addr; switch (state) { case ODEBUG_STATE_ACTIVE: percpu_counter_destroy(fbc); debug_object_free(fbc, &percpu_counter_debug_descr); return 1; default: return 0; } } static struct debug_obj_descr percpu_counter_debug_descr = { .name = "percpu_counter", .fixup_free = percpu_counter_fixup_free, }; static inline void debug_percpu_counter_activate(struct percpu_counter *fbc) { debug_object_init(fbc, &percpu_counter_debug_descr); debug_object_activate(fbc, &percpu_counter_debug_descr); } static inline void debug_percpu_counter_deactivate(struct percpu_counter *fbc) { debug_object_deactivate(fbc, &percpu_counter_debug_descr); debug_object_free(fbc, &percpu_counter_debug_descr); } #else /* CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER */ static inline void debug_percpu_counter_activate(struct percpu_counter *fbc) { } static inline void debug_percpu_counter_deactivate(struct percpu_counter *fbc) { } #endif /* CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER */ void percpu_counter_set(struct percpu_counter *fbc, s64 amount) { int cpu; spin_lock(&fbc->lock); for_each_possible_cpu(cpu) { s32 *pcount = per_cpu_ptr(fbc->counters, cpu); *pcount = 0; } fbc->count = amount; spin_unlock(&fbc->lock); } EXPORT_SYMBOL(percpu_counter_set); void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch) { s64 count; preempt_disable(); count = __this_cpu_read(*fbc->counters) + amount; if (count >= batch || count <= -batch) { spin_lock(&fbc->lock); fbc->count += count; __this_cpu_write(*fbc->counters, 0); spin_unlock(&fbc->lock); } else { __this_cpu_write(*fbc->counters, count); } preempt_enable(); } EXPORT_SYMBOL(__percpu_counter_add); /* * Add up all the per-cpu counts, return the result. This is a more accurate * but much slower version of percpu_counter_read_positive() */ s64 __percpu_counter_sum(struct percpu_counter *fbc) { s64 ret; int cpu; spin_lock(&fbc->lock); ret = fbc->count; for_each_online_cpu(cpu) { s32 *pcount = per_cpu_ptr(fbc->counters, cpu); ret += *pcount; } spin_unlock(&fbc->lock); return ret; } EXPORT_SYMBOL(__percpu_counter_sum); int __percpu_counter_init(struct percpu_counter *fbc, s64 amount, struct lock_class_key *key) { spin_lock_init(&fbc->lock); lockdep_set_class(&fbc->lock, key); fbc->count = amount; fbc->counters = alloc_percpu(s32); if (!fbc->counters) return -ENOMEM; debug_percpu_counter_activate(fbc); #ifdef CONFIG_HOTPLUG_CPU INIT_LIST_HEAD(&fbc->list); mutex_lock(&percpu_counters_lock); list_add(&fbc->list, &percpu_counters); mutex_unlock(&percpu_counters_lock); #endif return 0; } EXPORT_SYMBOL(__percpu_counter_init); void percpu_counter_destroy(struct percpu_counter *fbc) { if (!fbc->counters) return; debug_percpu_counter_deactivate(fbc); #ifdef CONFIG_HOTPLUG_CPU mutex_lock(&percpu_counters_lock); list_del(&fbc->list); mutex_unlock(&percpu_counters_lock); #endif free_percpu(fbc->counters); fbc->counters = NULL; } EXPORT_SYMBOL(percpu_counter_destroy); int percpu_counter_batch __read_mostly = 32; EXPORT_SYMBOL(percpu_counter_batch); static void compute_batch_value(void) { int nr = num_online_cpus(); percpu_counter_batch = max(32, nr*2); } static int __cpuinit percpu_counter_hotcpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu) { #ifdef CONFIG_HOTPLUG_CPU unsigned int cpu; struct percpu_counter *fbc; compute_batch_value(); if (action != CPU_DEAD) return NOTIFY_OK; cpu = (unsigned long)hcpu; mutex_lock(&percpu_counters_lock); list_for_each_entry(fbc, &percpu_counters, list) { s32 *pcount; unsigned long flags; spin_lock_irqsave(&fbc->lock, flags); pcount = per_cpu_ptr(fbc->counters, cpu); fbc->count += *pcount; *pcount = 0; spin_unlock_irqrestore(&fbc->lock, flags); } mutex_unlock(&percpu_counters_lock); #endif return NOTIFY_OK; } /* * Compare counter against given value. * Return 1 if greater, 0 if equal and -1 if less */ int percpu_counter_compare(struct percpu_counter *fbc, s64 rhs) { s64 count; count = percpu_counter_read(fbc); /* Check to see if rough count will be sufficient for comparison */ if (abs(count - rhs) > (percpu_counter_batch*num_online_cpus())) { if (count > rhs) return 1; else return -1; } /* Need to use precise count */ count = percpu_counter_sum(fbc); if (count > rhs) return 1; else if (count < rhs) return -1; else return 0; } EXPORT_SYMBOL(percpu_counter_compare); static int __init percpu_counter_startup(void) { compute_batch_value(); hotcpu_notifier(percpu_counter_hotcpu_callback, 0); return 0; } module_init(percpu_counter_startup);


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